Designated Series II, the new graders cover the GD555-3 Series II (104-119 kW, 17,100 kg) and the GD655-3 Series II (123-142 kW, 17,900 kg) .
Common to all the new Series II graders is a new cooling system, allowing them to handle up to 50° Celsius ambient temperatures, a full-length belly guard for improved engine compartment protection and improved cab steps.
In addition, the GD555-3 Series II now has six circle-support shoes for greater strength, durability and reliability.
As with the previous GXX graders, all feature Komatsu components throughout, with all machine components designed and manufactured by Komatsu to work together as an integrated whole.
Other key features include:
- Dual direct-drive/torque converter transmission, giving the operator the choice of direct drive transmission as used on conventional graders or torque converter transmission for improved control at low speeds and in final finishing – all at the flick of a switch.
- A hydraulic system – based on Komatsu’s patented HydrauMind system used on its excavators – delivering full constant speed regardless of engine rpm.
- Overall excellent visibility, giving the operator an unmatched view out the front, to the front wheels, full width of the blade and even the rear ripper shanks.
- Tight turning circle due to the combination of steering angle, articulation, wheel lean and oscillation.
- Reduced wheel spin through a manual lock/unlock differential.
- Low in-cab noise levels.
According to Kevin Edwards, Komatsu Australia’s Business Manager, Government, the latest changes will ensure the highest levels of reliability and durability for Komatsu’s construction grader range.
"In developing the Series II grader range, we’ve listened very closely to our customers – particularly those in local government – to ensure they best meet the needs of grader owners and operators in Australia’s very harsh and remote conditions," he said.